CONTENTS—Continued Section Page 2. Hydraulic Design of Main. Outlet Works 46. Discharge capacities 64 47. Hydraulic losses 64 (a) Modifications subsequent to construction 69 3. Structural Design of Main Outlet Works 48. General 69 49. Intake structure 69 50. Transition section at upstream portal 72 51. Tunnel upstream of gate structure 72 52. Gate structure and shaft . . . . • 73 53. Tunnel downstream of gate structure 74 54. Diversion channel 74 55. Steel pipe manifold anchorage and valve house substructure 74 56. Control house 74 57. Valve house 74 58. Stilling basin 75 4. Description of Auxiliary Outlet Works 59. Intake structure 75 60. Tunnel upstream of gate chamber 75 61. Gate chamber 75 62. Tunnel downstream of gate chamber 75 5. Hydraulic Design of Auxiliary.Outlet Works 63. General 75 64. Discharge capacities 79 65. Hydraulic computations 79 6. Structural Design of Auxiliary Outlet Works 66. General 82 67. Intake structure and tunnel upstream of gate chamber 82 68. Gate chamber 84 69. Tunnel downstream of gate chamber 84 D. River Diversion During Construction 70. Diversion studies for handling riverflows 84 71. Diversion plan 84 72. Downstream flow requirements 85 CHAPTER V. Design --MECHANICAL AND MISCELLANEOUS INSTALLATIONS A. Main Outlet Works 73. Stoplogs 87 74. Elliptical intake bulkhead 87 (a) Description 87 (b) Design 87 75. Trashracks 90 (a) Trashracks for main intake structure 90 (b) Trashrack for bypass pipe 90 CONTENTS—Continued Section Page 76. Ice-prevention air system 90 (a) Description 90 (b) Design 93 77. 6- by 13-foot fixed-wheel gate 93 (a) Description 93 (b) Design 93 78. Hoist and controls for 6- by 13-foot fixed-wheel gate 96 (a) Description 96 (b) Design 96 79. Steel outlet pipe 97 (a) Description 97 (b) Design 101 80. 72-inch ring-follower gates 101 (a) Description 101 (b) Design 101 81. 72-inch hollow-jet valves 101 (a) Description 101 (b) Design 107 82. Controls for 72-inch ring-follower gates and 72-inch hollow-jet valves 107 (a) Description 107 (b) Design 112 83. 30-inch ring-follower gate 112 (a) Description 112 (b) Design 112 84. 30-inch hollow-jet valve 115 (a) Description 115 (b) Design 115 85. Controls for the 30-inch ring-follower gate and 30-inch hollow-jet valve 115 (a) Description 115 (b) Design 120 B. Auxiliary Outlet Works 86. Trashracks 120 87. 4- by 4-foot tandem outlet gate and controls 120 (a) Description 120 (b) Design 126 C ON TENTS- - C ontinued Section Page C. Miscellaneous Equipment for Main and Auxiliary Outlet Works 88. Gate chamber and tunnel ventilation system 127 (a) Description 127 (b) Design 127 89. Electrical system 127 PART m—CONSTRUCTION 90. Specifications No. DC-5056—Navajo Dam and Access Roads 133 (a) Orders for changes 133 (b) Extra work orders 134 91. Minor construction contracts 134 92. Government organization 134 93. Contractors' forces 134 (a) Organization 134 (b) Wage rates 136 94. Factors affecting construction progress 137 (a) Weather 137 (b) Labor 137 (c) Other 157 95. Construction equipment 137 96. Safety—Government forces 138 97. Safety—Contractors' forces 138 CHAPTER VH. Construction—EARTH DAM AND APPURTENANT STRUCTURES 98. General 139 99. Diversion and care of the river during construction 139 100. Access and service roads 140 A. Excavation 101. Main outlet works tunnel excavation 141 102. Auxiliary outlet works tunnel excavation 141 103. Excavation for dam foundation 143 (a) Excavation right of station 44+00 143 (b) Excavation left of station 44+00 143 104. Open cut for structures 143 105. Spillway excavation 145 106. Excavation in excavation area 1 145 B. Borrow Area Operations 107. General 146 108. Borrow area group 1 (borrow area E) 146 CONTENTS--Continued Section Page 109. Borrow area group 2 (borrow areas 9 and D) 146 110. Borrow area group 3 (borrow areas 5. 6, 7, and 8) 147 111. Borrow area group 4 (borrow area 10) 148 112. Borrow area F 149 C. Embankment Operations 113. General 149 114. Zone 1 149 115. Zone 2 151 116. Zone 3 151 117. Earthwork control 151 118. Embankment test installations 151 119. Riprap 151 D. Drilling and Grouting 120. General 153 121. Foundation grouting 153 122. Blanket grouting 156 123. Backfill grouting 156 (a) Main outlet works tunnel 156 (b) Auxiliary outlet works tunnel 156 (c) Access tunnels and gate structure and gate shaft 156 124. Tunnel pressure grouting 156 (a) Main outlet works tunnel 156 (b) Access tunnels and shaft 157 (c) Gate structure and gate shaft 157 (d) Auxiliary outlet works tunnel 157 125. Miscellaneous grouting 157 126. Drilling and grouting equipment 157 127. Contractor's grouting personnel 158 128. Grouting inspection and reports 158 129. Drainage holes 158 E. Concrete Control 130. Concrete batching and mixing plants 159 (a) Temporary plant 159 (b) Central plant 159 131. Concrete aggregates 161 132. Cement 162 133. Curing and concrete protection 162 134. Concrete control and testing 162 F. Concrete Structures and Placement 135. Grout cap 165 136. Spillway 165 137. Main outlet works 172 (a) Intake structure 172 (b) Tunnel 173 CONTENTS--Continued Section Page (c) Gate chamber 173 (d) Gate shaft 176 (e) Stilling basin 176 138. Auxiliary outlet works and access tunnels 176 (a) Intake structure 176 (b) Access tunnels and access shaft 176 (c) Auxiliary outlet works tunnel 176 (d) Gate chamber 176 139. Miscellaneous structures 179 (a) Control houses and manifold block 179 (b) Piezometer terminal well 179 140. Reinforcement 179 141. Anchor bars 179 142. Tile drains 180 CHAPTER VIE. Construction —INSTALLATION OF METALWORK AND MACHINERY 143. General 181 144. Elliptical intake bulkhead 181 145. Tandem outlet gate 181 146. 6- by 13-foot fixed-wheel gate 182 147. 72-inch ring-follower gates and 72-inch hollow-jet valves 182 148. 30-inch ring-follower gate and 30-inch hollow-jet valve 185 >49. Hydraulic control systems 186 150. Outlet pipe and walkway 186 151. Ice-prevention air system 186 152. Ventilating systems 187 153. Reservoir level recorder and floatwell 187 154. Trashracks 188 CHAPTER IX. Construction --INSTALLATION OF TEST APPARATUS 155. General 189 156. Installation of piezometer tips 189 (a) Foundation tips 189 (b) Embankment tips 189 157. Description of piezometer tips and tubing 189 158. Description of the terminal well 190 159. Filling piezometer tubes with water 190 160. Crossarm settlement installation 191 161. Surface settlement points 192 APPENDIX A. Cost summary for Navajo Dam, Reservoir, and appurtenant structures, showing cost of construction and supply contracts and purchase orders (actual costs to October 31, 1964) 193 B. Construction costs by pay items—Specifications No. DC-5056, Contract No. 14-06-D-2878--Construction of Navajo Dam and appurtenant structures 196 |