Engineering and Contracting . ODS FOR BOONE COUNTY,lA., COURTHOUSE. The use of a 52-ft. tower and stiff leg derricks is en-abling the conti:actor for the $200,000 court house atBoone, la., to make rapid progress in the erection of thestructure. The building will be 81 ft. by 146 ft. 10 in., four storiesand basement. The walls will be faced with granite forthe two base courses and with Bedford limestone above,all backed with hard burned shale brick. All floors androof will be of reinforced concrete and hollow tile. Thederricks used on the job consist of two 5-ton stiff leg,placed on a tower 38
Engineering and Contracting . ODS FOR BOONE COUNTY,lA., COURTHOUSE. The use of a 52-ft. tower and stiff leg derricks is en-abling the conti:actor for the $200,000 court house atBoone, la., to make rapid progress in the erection of thestructure. The building will be 81 ft. by 146 ft. 10 in., four storiesand basement. The walls will be faced with granite forthe two base courses and with Bedford limestone above,all backed with hard burned shale brick. All floors androof will be of reinforced concrete and hollow tile. Thederricks used on the job consist of two 5-ton stiff leg,placed on a tower 38 ft. by 38 ft. by 52 ft. high. Thistower is made up,with 10 in. by 10 in. posts, 3 in. by 10 and 10 in. by 10 in. sills and plates. The followinginformation applies to each derrick: Mast 12 in. by 12 in.—36 ft. long Boom 10 in. by 12 in.—70 ft. long Stiff legs 10 in. by 10 in. Bull wheel 12 ft. diameter The derricks were constructed of fir timbers with struc-tural steel fittings which were furnished by the Minne-. Tower and Derricks Used in Erecting Court House at Boone, Iowa. apolis Steel Machinery Co. of Minneapolis, Minn. Theframing was all done by union carpenters at the buildingsite. The derricks are operated by an American hoisting en-gine 5j-in. by 8-in. double cylinders, double drum withboom swinging attachment. The tower is placed approximately in the center of thebuilding with derricks placed on opposite corners the longway of the building, so that each derrick covers one-halfof the building. The braces are so placed as to clear thefloors. This design enables the outside wall to be carriedstory high on one end of the building at a time, thus per-mitting the concrete floor on that half to be poured whilethe walls on the other end are being carried up. By thismethod the stone masons, brick masons and carpenterscan be kept busy practically all of the time and the con-crete floors are given sufficient time to set before resum-ing the construction of the outsi
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