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CHAPTER VI--Design--MECHANICAL AND ELECTRICAL--SPILLWAY

AND OUTLET WORKS

A. Intake Structures

62. 20- by 50-Foot Spillway Radial Gates and Hoists. - (a) Requirement.-- The radial gates are installed on the crest of the tunnel spillway. They provide emergency spillway regulation and will normally be closed until the water surface reaches elevation 5620.0.

(b) General Description.--The gates are detailed on figures 75 through 78 and on drawing 456-D-1168.* The gates were furnished under invitation No. DS-4078.

The design head is 50 feet with the water surface at the top of the gate, elevation 5620.0. The gates rotate on a 58-foot radius about the trunnion pins and contact the sillplate on the crest at elevation 5570.0. The maximum gate opening is 42.5 feet. The maximum water surface is at elevation 5621.0 with the gates open.

Each gate consists of a curved skinplate assembly supported on a structural steel framework consisting of wide-flange beams, diaphragms, cross bracing, and two arm assemblies. The water load on the upstream side of the gate leaf is transmitted through the skinplate to the wide-flange beams which in turn transmit the load to the diaphrams. The diaphragms carry the load to the arms and trunnion pins which are located at the center of curvature of the upstream skinplate. The trunnion pins are mounted on pedestals which are partially embedded in the headwall of the tunnel spillway. The pedestals were alined and held in place by means of anchor bolts and jacks before making the final placement of concrete in the blockouts.

The angular-shaped rubber seals on each side of the gate are equipped with detachable brass seal bars in order to reduce the seal friction to a minimum. These seals are held against the stainless clad wallplates by the water pressure. A flat bar rubber seal is used along the bottom edge of the skinplate. When the gate is on the sill, the bottom seal is compressed against the stainless clad sillplate, thereby preventing leakage along the lower edge of the skinplate.

Lateral movement of the gate is controlled by three guide shoes on each side of the gate. The shoes slide against the wallplates which are embedded in the end walls and pier. Two sets of hoisting wire ropes are connected to the lifting brackets mounted on the skinplate. The gate is provided with a motor-driven wire-rope hoist located on the operating bridge.

The gate arms consist of wide-flange beams and bracing connecting to hubs which are mounted on the trunnion pins. The pin bushings in the hubs of the arms are provided with grease grooves. Grease fittings on the hub are furnished to insure proper lubrication. The entire trunnion pin bearing is protected against foreign matter by seals and

covers.

The estimated weight of the movable parts of each gate is 155,000 pounds. The estimated weight of the embedded metalwork for each gate is 21,200 pounds. The estimated hoist load is 120,000 pounds.

*Not included.

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Figure 75.--20- by 50-foot radial gate, embedded metalwork--Anchor bolts and bolt settings. From drawing 456-D-290.

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Figure 76.--20- by 50-foot radial gate, embedded metalwork--Wallplate and sillplate assembly. From drawing 456-D-291.

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Figure 77.--20- by 50-foot radial gate--General installation.

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