Fixed-Wheel Gates Uses and Limitationsby B. T. A. Sagar, ATC Engineering Consultants Inc, United States,
Abstract: The fixed-wheel type of gate, which derives its name from sets of wheels mounted on axles fixed to the gate, rolls upon and transmits the hydraulic load of the gate to guide tracks bearing on the hydraulic headwall structure. The use of wheels results in relatively low friction for gate operation thereby enabling such gates to self-close under the effect of gravity alone. Gate performance is improved through adequately designed hydraulic hoist systems, self-lubricating bronze bushings, and teflon-coated rubber seals. Tapering the lower portions of gate slots discourages the accumulation of silt. Downstream sealing of gates is recommended to provide adequate downpull for assuring self-closing action. Hydraulic actuated gate hoists are generally recommended, but for low head operating conditions, as usually encountered for spillway service, the use of rope drum hoists is a satisfactory alternative.
Subject Headings: Gates (hydraulic) | Hydraulic loads | Hydraulic design | Hoisting | Load bearing capacity | Vehicle loads | Friction
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