Content Inside :
The principal objective in compiling the material for this CONCRETE PIPE DESIGN MANUAL was to present data and information on the design of concrete pipe systems in a readily usable form. The Design Manual is a companion volume to the CONCRETE PIPE HANDBOOK which provides an up-to-date compilation of the concepts and theories which form the basis for the design and installation of precast concrete pipe sewers and culverts and explanations for the charts, tables and design procedures summarized in the Design Manual. The hydraulic design procedure for sewers requires: 1. Determination of Sewer System Type 2. Determination of Design Flow 3. Selection of Pipe Size 4. Determination of Flow Velocity. SELECTION OF PIPE SIZE After the design flows have been calculated, pipe size is selected using Manning’s formula. DETERMINATION OF FLOW VELOCITY Minimum Velocity. Slopes required to maintain a velocity of 2 feet per second under full flow conditions with various “n” values are listed in Table 7 for circular pipe. DETERMINATION OF SEWER SYSTEM TYPE Storm sewers are designed to carry precipitation runoff, surface waters and, in some instances, ground water. Storm water flow is analyzed on the basis of having the flow characteristics of water. The hydraulic design procedure for culverts requires: 1. Determination of Design Flow 2. Selection of Culvert Size 3. Determination of Outlet Velocity. Factors Affecting Culvert Discharge. NOMOGRAPH PROCEDURE, example problems. LOADS AND SUPPORTING STRENGTHS The design procedure for the selection of pipe strength requires: I . Determination of Earth Load 2. Determination of Live Load 3. Selection of Bedding 4. Determination of Bedding Factor 5. Application of Factor of Safety 6. Selection of Pipe Strength. DETERMINATION OF EARTH LOAD Embankment Soil Load. Concrete pipe can be installed in either an embankment or trench condition as discussed previously. Total Live Load. A designer is concerned with the maximum possible loads, which occur when the distributed load area is centered over the buried pipe. Depending on the pipe size and height of cover, the most critical loading orientation can occur either when the truck travels transverse or parallel to the centerline of the pipe. Supplemental data : CIRCULAR CONCRETE PIPE, ELLIPTICAL CONCRETE PIPE.
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