PCI: Tolerance Manual for Precast and Prestressed Concrete Construction

[robertsas]

Tolerance Manual for Precast and Prestressed Concrete Construction - PCI

This new reference manual is intended to assist designers, producers and erectors of products for the building industry in determining the proper tolerances in every phase of the building process. The new manual contains information vital to architects, engineers, general contractors, precast and prestressed concrete producers, quality control agencies and other interfacing building trades. In a preface to its comprehensive volume, the PCI Committee On Tolerances says, in part, ""It is essential that the members of the building team collaborate to provide an overall project tolerance system which will meet all of the project's functional needs and allow economical fabrication and erection for the precast concrete members and all of the interfacing building systems."" To accomplish those objectives, the new manual contains a wealth of information covering both plant-cast and site-cast precast and precast prestressed concrete. The committee warns, however, that the tolerances defined in the manual are designed to provide a reference point, not be rigid and unyielding. The tolerances contained within the manual are based on current modern precast concrete production techniques. The report preface points out that its intent is to provide the tools to enable the party responsible for tolerances to develop a tolerance plant that will lead to a successful project. The nearly 200-page manual defines the custom nature of building construction, defines tolerance categories, identifies tolerance issues, discusses responsibility for project dimensional control and describes mechanisms for handling tolerance discrepancies. Other sections of the document deal with a variety of issues, beginning with definition of tolerance related terms, relationships among various tolerance groups, product tolerances, special tolerance considerations, individual product tolerance listings, erection tolerances, mixed building system erection tolerances, clearance considerations, interfacing tolerances, design approaches for interfacing tolerance systems and characteristics of a tolerance interface. Later sections in the manual include a variety of typical tolerance related details as well as examples of tolerance detailing related calculations. Appendices provide the reader with examples of specification language and even sample contract language. The new publication complements and supports two other previously published PCI quality control manuals. These include MNL-116 Manual for Quality Control for Plants and Production of Precast and Prestressed Concrete Products and MNL-117 Manual for Quality Control for Plants and Production of Architectural Precast Concrete Products. The three documents form the basis of quality design and quality fabrication and erection for Precast and Prestressed Concrete Products. The new manual is designated MNL 135-00.

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