Canadian engineer . considered as a unit,is rarely as low as could be desired, their value to thecounties from an educational standpoint, and to the concreteindustry, is sufficient to warrant a much greater expenditureif necessary. The construction work has just been completed on abridge of this kind crossing Wolf creek, in Clay township,Grundy county. The bridge is a reinforced concrete slab of18 ft. clear span, and a clear roadway of 17 ft. 6 ins. Theconstruction work was done by the county bridge crew underthe general direction of the writer, who attempted to keepan itemized and accurate ac
Canadian engineer . considered as a unit,is rarely as low as could be desired, their value to thecounties from an educational standpoint, and to the concreteindustry, is sufficient to warrant a much greater expenditureif necessary. The construction work has just been completed on abridge of this kind crossing Wolf creek, in Clay township,Grundy county. The bridge is a reinforced concrete slab of18 ft. clear span, and a clear roadway of 17 ft. 6 ins. Theconstruction work was done by the county bridge crew underthe general direction of the writer, who attempted to keepan itemized and accurate account of the cost of each opera-tion. Because of the fact that very little data of this kindon structures so small as this, has been published, and be-cause the design of the bridge embodies several featuressuch as the use of shop built reinforcement, which shouldinterest every county bridge official, a brief description ofthe design and an account of the construction is here sub-mitted. ,? ^^ g--*- K^ «•-«•. ..Eievaticn, Slab and Abutment Sections, Bridge No. 1301,Wolf Creek. Abutments.—The abutments were designed as simple re-taining walls to withstand a horizontal pressure equal toone-third the vertical, including a surcharge of 2 ft. abovethe bridge seat. The reinforcing in the back and top offooting was made of sufficiently great cross sectional areato withstand the tendency to crack at base of stem, whilethe bars in the front face were simply a precaution against ,t and other action which would operate to crack theabutment horizontally in front, should the expansion jointat the bridge scat become defective. While this latter pre-caution is perhaps not absolutely necessary, it seemed war-ranted by the number of abutments throughout the statewhich have developed horizontal cracks for seemingly noother reason. An analysis of the abutment, account beingtaken of the dead weight of that portion of the slab restinjfupon it, shows the resultant line of pressure to pi
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishertoron, bookyear1893
