Grouting equipment in Springwells tunnel shaft, Detroit water supply system
Description:
View of grouting equipment in Springwells tunnel shaft, Detroit water supply system. Printed on front: "#21. Springwells tunnel contract section no. 4. Mark R. Hanna Co., contractors. View showing greathead type of grout pan used in grouting. 1 1/2" W.I. grout pipe placed through crown of lining. Grouting follows concreting as soon as possible and is placed with pressures varying 65 to 85 pounds per square inch. May 28, 1928."
