ASCE 28-00 PDF Download

The ASCE 28-00 standard provides guidelines for the design and installation of precast concrete box sections used in trenchless construction projects. These box sections are commonly used for conveying sewage, industrial wastes, stormwater and drainage, utilities, and access ways.

The standard follows the Direct Design Method, which takes into account the interaction between the box section and the surrounding soil or grout envelope. This method determines the loads and distribution of earth pressure on the buried box sections, considering both the longitudinal loads due to jacking and the effects of the soil or grout envelope. These loads and pressure distributions are used to calculate circumferential moment, thrust, and shear in the wall/slab, which are then used to determine the required reinforcement.

The design criteria covered by the standard include various structural aspects, such as circumferential flexure, thrust, and shear strengths. It also includes considerations for crack width control and addresses the longitudinal thrust produced by jacking. Additionally, the standard provides guidance on handling and installation of the precast concrete box sections.