Boulder Canyon Project: Final ReportsUnited States Department of the Interior, Bureau of Reclamation, 1947 - Arch dams |
Contents
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Common terms and phrases
anchor Anchor bars approximately arch Arizona side bars base beams Boulder City Boulder Dam Breccia bulkhead gate buttresses cableway canyon wall canyon-wall outlet center line concrete lining conduits connecting construction adits construction joints crest crete curve cylinder gates diameter discharge drainage drill carriage elevation emergency gates equipment excavation forms gate leaf High-pressure grout hoist horizontal inclined tunnels inner diversion tunnels installed intake towers invert section keyway latite load located longitudinally lower gate needle valves Nevada side outer Arizona tunnel outer Nevada tunnel outlet tunnels penstock and outlet penstock tunnels pipe placed plate portals pounds per square powerhouse pressure rails reinforced concrete river roof seal SECTION A-A shaft shown in figure slab slope spaced spillway tunnel steel thousand cubic yards thousand second-feet tion top headings trashrack trucks tunnel inlet tunnel lining tunnel plug tunnel-plug outlet upper gate upstream cofferdam valve house vertical weir
Popular passages
Page 81 - Rock excavation, including all solid rock in place which could not be moved until loosened by barring, wedging, or blasting, and all boulders or detached pieces of solid rock more than one cubic yard in volume. Solid rock under this class, as distinguished from soft or disintegrated rock under common excavation, was defined as sound rock of such hardness and texture that it could not be effectively loosened or broken down by hand drifting picks.
Page 82 - The largest rock in the rock fill shall be not more than 1 cu. yd. in volume. The inclusion of gravel or rock spalls in the mass in an amount not in excess of that required to fill the voids in the coarser material shall be required.
Page 201 - ... section CC) by vertical endless trains or belts of rollers that extend throughout practically the entire height of the gate leaf and its follower ring. The leaf is lowered in closing until the bronze seal ring affixed to the downstream face of its bulkhead portion is brought into horizontal alignment with the mating bronze seat ring enclosing the water passageway in the adjacent face of the downstream gate frame, whereupon further downward movement of the gate leaf is arrested by lugs on the...
Page 80 - ... cut-off trenches and other parts of the work free from water as required for constructing each part of the work.
Page 201 - J£ in. When this has been accomplished, the toggles connecting the leaf and the crosshead are fully extended, whereupon the gate leaf with its ring follower, the two inclined roller trains, and the two roller carriages all move upward as a unit until such time as the ring follower is brought into axial alignment with the water passage or conduit, when limit switches stop the hoist nnd the upward movement ceases and the opening cycle is then completed.
Page 201 - ... contact between seating and sealing surfaces ever occurs while these gates are passing through their opening or closing cycles of operation, and in consequence those surfaces are not subjected to the rapid wear and deterioration that occurs when sliding contact under high-intensity loadings is present. Inasmuch as all movements of the gate leaf occur while it is supported and transported on the roller-train systems as described, the force or power input required to operate it is relatively small....
Page 17 - The rodman was lowered by %-inch rope, snubbed around two drills driven securely into crevices in the rock. When he reached the river's edge, he removed the rope and returned by trail and ladders to the top. While one rodman was returning, another was being lowered at a different location. In making the survey, about 4,000 points were located in one section of the canyon wall having a horizontal area of 330 feet by 660 feet, the greater dimension being parallel to the river.
Page 309 - Sb, the latter being projected to the horizontal as shown. Numerical values for the dimensions were determined at various points along the transition, based on the size of water area, plus a desired air area, required for the flowing stream. The water area, which contracts as...