Grouting at Boston Children’s Hospital-PPT Presentation

PPT Presentation

Pdf Summary

The 11-story Boston Children’s Hospital Hale Building was constructed from 2017 to 2021, with a slurry-wall foundation located as close as five feet from neighboring buildings. During slurry-wall installation, pressure from concrete and slurry traveled through marine sand and clay, causing the basement slab of the hospital morgue to buckle and allowing material to spread across the floor. Work was halted to prevent further damage.<br /><br />Haley & Aldrich proposed stabilizing the soil with permeation grouting, and Hub Foundation joined the design team to develop the program. The team used a cement-bentonite grout, called “Cementinite,” designed to solidify the sand while allowing slurry-wall excavation to continue.<br /><br />The program included 119 grout locations, with treatment zones 25 to 30 feet below grade. Crews installed tube-a-manchette (TAM) pipes and injected grout through isolated ports using double packers. Primary and secondary injection sequences, pressure-volume reviews, and a maximum grouting pressure of 50 psi helped guide the work.<br /><br />Two drilling crews worked seven days a week alongside a separate grouting crew. The program was completed in four weeks—three weeks of drilling, with grouting following on a one-week lag. No further incidents were reported in adjacent buildings, and the grouting did not delay continued slurry-wall installation.

Keywords

Boston Children's Hospital

Hale Building

slurry wall foundation

permeation grouting

cement-bentonite grout

Cementinite

tube-a-manchette

ground stabilization

morgue basement slab

construction damage mitigation