By American Concrete Pipe Association
The CONCRETE PIPE layout handbook is an essential software to assist engineers decide upon the sort, measurement, and energy requisites of pipe. It removes the long computations formerly required. The handbook contains common installations utilizing the oblique layout approach. greater than 330 pages of tables and figures overlaying hydraulics of sewers and culverts, stay lots and earth a lot, aiding strengths and supplemental layout info are indexed. exact instance difficulties of particular functions illustrate using the time saving layout aids incorporated within the handbook.
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Example text
0. The dashed H = p’Bd line represents the limiting condition where the height of fill is at the same elevation as the natural ground surface. The dashed H = He line represents the condition where the height of the plane of equal settlement (He) is equal to the height of fill (H). Jacked or Tunneled Soil Load. This type of installation is used where surface conditions make it difficult to install the pipe by conventional open excavation and backfill methods, or where it is necessary to install the pipe under an existing embankment.
With no surface loads or surface structure requirements, these areas need not be compacted. 5 Equivalent USCS and AASHTO Soil Classifications for SIDD Soil Designations Representative Soil Types SIDD Soil USCS, Percent Compaction Standard Standard Modified AASHTO Proctor Proctor Gravelly SW, SP, A1,A3 Sand GW, GP (Category 1) 100 95 90 85 80 61 95 90 85 80 75 59 Sandy GM, SM, ML, A2, A4 Silt Also GC, SC (Category II) with less than 20% passing #200 sieve 100 95 90 85 80 49 95 90 85 80 75 46 Silty CL, MH, A5, A6 Clay GC, SC (Category III) 100 95 90 85 80 45 90 85 80 75 70 40 Selection of Standard Installation The selection of a Standard Installation for a project should be based on an evaluation of the quality of construction and inspection anticipated.
D. Allowable headwater depth, in feet, which is the vertical distance from the culvert invert (flow line) at the entrance to the water surface elevation permissible in the headwater pool or approach channel upstream from the culvert. Mean and maximum flood velocities in natural stream. Type of culvert for first trial selection, including barrel cross sectional shape and entrance type. 0. Inlet Control (1) Given Q, size and type of culvert, use appropriate inlet control nomograph Figures 33 through 37 to find headwater depth: (a) Connect with a straightedge the given culvert diameter or height (D) and the discharge Q; mark intersection of straightedge on HW/D scale marked (1).