Stone Wall Rehabilitation / Grouting Mallow Bridge Mallow Co Cork

Stone Wall Rehabilitation / Grouting Mallow Bridge Mallow Co Cork

Grouting

TAL were engaged as a specialist sub-contractor (Main Contractor – BAM Contractors) to carry out strengthening of soils (under a public roadway) behind the stone retaining walls flanking the Blackwater River located adjacent to Mallow Bridge. Poor pointing of the stonework was allowing water ingress through the wall to create voids and had caused weakening / erosion of the soil structure over a long period of time. Remedial works involved drilling / removing sections of the stone wall at strategic locations & injecting grout to depths of approximately 2 meters. Achieving the optimum pressure at which the grout was injected was key to the success of these works as it had to be sufficient to ensure all voids were being filled. Work was carried out over two phases to facilitate the main contract programme. Road closure licenses were attained and all adjacent services had to be carefully traced, identified and monitored during the grouting process. On completion the walls were repaired and fully repointed by the Main Contractor. Details methods statements and site specific risk assessments for the works were prepared and submitted to OPW representatives for approval prior to commencing any work.