PRECAST CONCRETE MANHOLES

[Pages:143]PRECAST CONCRETE MANHOLES

WHY PROVIDE GUIDELINES?

Past Problems

? Was tedious to keep track of variables

? Was easy to make mistakes ? Wanted: A design tool to reduce

problems

TOPICS

? Overview on Precast Manholes ? Applications ? Design Procedures and

Applicable Standards ? Watertight Structures ? Quality ? Installation

PRECAST CONCRETE MANHOLES

Round Structures

? ASTM C478, "Standard Specification for Precast Reinforced Concrete Manhole Sections"

PRECAST CONCRETE MANHOLES

Rectangle / Square Structures

? ASTM C913, "Standard Specification for Precast Concrete Water and Wastewater Structures"

? DO NOT Specify a Box Culvert for a vertical application. Box Culverts are designed for horizontal installations and loading conditions.

? Specify ASTM C913 for square structures.

COMMON SIZES

Round ? ASTM C478

? Internal Diameter (I.D.) ? 36" ? 144" ? Check with local

manufacturer for availability of larger diameter structures. Custom box structures are easily fabricated using universal forming equipment.

COMMON SIZES

Rectangle / Square ASTM C913

? 24" x 24" to 72" x 72" ? sizes increase by 6"

increments

MANUFACTURING METHODS

Wet-Cast

? Cast with an inner and outer form. ? Product cured in the form. ? Blockouts/hole formers can easily be incorporated.

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