. Journal of the New England Water Works Association . were begun, the derrick and boom were dismantled andhoisted out piece by piece by means of t he gin pole. After the erection of the sixth course of side plates, but previous to the removal of the derrick, grouting operations were commenced, to fillthe space between the tank bottom and the concrete foundation. The 300 DESIGN AND CONSTRUCTION OF GLOVERSVILLE STANDPIPE. grout was composed of a mixture of cement, sand, and water in the pro-portions of one pari by volume of Portland cement to one part of finesand, with only sufficient water to
. Journal of the New England Water Works Association . were begun, the derrick and boom were dismantled andhoisted out piece by piece by means of t he gin pole. After the erection of the sixth course of side plates, but previous to the removal of the derrick, grouting operations were commenced, to fillthe space between the tank bottom and the concrete foundation. The 300 DESIGN AND CONSTRUCTION OF GLOVERSVILLE STANDPIPE. grout was composed of a mixture of cement, sand, and water in the pro-portions of one pari by volume of Portland cement to one part of finesand, with only sufficient water to make the mixture flow freely. Threaded flanges were provided in each of the plates forming thebottom of the standpipe, into which were inserted 2-in. wrought irongrouting pipes limited in length to 24 in., in order to avoid undue upwardpressure upon the bottom plates. Through these grout was poured untilthe space between the bottom of the tank and the concrete foundation wasfilled as completely as possible. Some difficulty was experienced in filling. Plate IV. this space, because of buckling of the plates due in part to the grout pres-sure and partly to expansion from the heat of the sun. Some upwardmovement of the center plates may have occurred when the derrick wasremoved, so that it cannot be said that the grouting operation was entirelysatisfactory. It is believed to be somewhat more satisfactory than thesand-cement cushion method of bedding the bottom plates. Neithermethod seems ideal results, although both methods have been usedsuccessfully. It is anticipated, however, that with water in the tank afairly uniform pressure of the structure on the grouted foundation will beobtained. Upon completion of the grouting the grout pipes were removedand the threaded flange holes closed with screw plugs. In the erection of the plates very little work was required to fair theholes, — that is, to make the holes match. While drift pins were used to MARSTOX. 301 a slight extent
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